Copper Mountain non-controlling interest acquisition (Schedule of detailed information about acquisition transaction) (Details) - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended |
|---|---|---|
Apr. 30, 2025 |
Dec. 31, 2025 |
|
| Disclosure of detailed information about business combination [line items] | ||
| Surplus - recorded in equity | $ (35.9) | |
| Copper Mountain Mine (BC) Ltd. [Member] | ||
| Disclosure of detailed information about business combination [line items] | ||
| Surplus - recorded in equity | $ 61.3 | |
| Copper Mountain Mine (BC) Ltd. [Member] | Mitsubishi Materials Corporation [Member] | ||
| Disclosure of detailed information about business combination [line items] | ||
| Carrying value of non-controlling interest as at April 30, 2025 | 93.2 | |
| Transfer of net gain on translation of foreign currency balances | 4.0 | |
| Less: total consideration | $ (35.9) |